From those pictures above they appeared to be MD as John1 stated.
I suggest getting the book treasure hunting Mercury dimes, also check out VarietyVista site for Mercury dimes RPM, the 42-D so far have a total of 16 listing, most are minor, one's that have premium are listed in the CherryPickers' Guide.
I suggest getting the book treasure hunting Mercury dimes, also check out VarietyVista site for Mercury dimes RPM, the 42-D so far have a total of 16 listing, most are minor, one's that have premium are listed in the CherryPickers' Guide.





















